When you’re in Chrome or Safari and want to open a citation, you’ll see the familiar Zotero icons (for book, article, newspaper, etc.). In Chrome, the icon is in the same place as FF, at the end of the URL address box.

In Safari, the icon hows up in b&w, not color, on the left:

Zotero does not open as a pane at the bottom of your Chrome or Safari window. You need to open it up by clicking on the desktop icon.